Interior cargo dimensions in inches?

Here's an old thread with some measurements...

Prius v trunk dimensions | PriusChat

Why not simply get a tape measure and measure the distance?

 

A limitation of the Prius v when it comes to carrying large objects is that the rear seats do not fold flat. While a large object might fit into the hatch opening, the upwardly rising floor can cause the front of the object to contact the headliner. So .. be sure to verify that the object you need to carry will not contact the headliner above the rear seats.

If the object won't fit in your Prius v and you can't con a friend into helping you retrieve the object with her/his larger vehicle, renting a van might be an option. Minivan rentals at regular car rental companies usually come with unlimited mileage and are usually in a lower cost category. Although I'm not a fan of Chrysler/Dodge vehicles, most have 2nd and 3rd row seats that stow into the floor and provide a flat floor behind the front seats.

 

Also we need info on the object in question, something long like a 10-ft kayak can sometimes "almost" fit by additionally putting the front seat down...